my neighbor did the same thing... Bought a truck, and a few weeks after, the whole back of the cab on the drivers side was crunched and crumbled in. I could never own a short bed, because once you put a toolbox in the bed, you don't have much room left. When I put my big ice chest up against the toolbox, I can hook my GN up, and not have to worry about the cooler moving anywhere... If it was a short bed, I would have to probably load the cooler behind the ball, IF there was enough room. .
If you are going to be towing a GN, go with a long bed! Otherwise, don't say we didn't warn ya!
-Chris-